Characteristics of BaTiO3-coated Ag powders directly prepared by spray pyrolysis

Spherical BaTiO3-coated Ag powders with dense structures were directly prepared by spray pyrolysis. Ag powder with 1 wt % BaTiO3 has particles of 0.53 mu m mean diameter. BaTiO3 had good properties for coating Ag powders: it decreased the sintering of the Ag powder at temperatures between 700 and 900 degrees C. Complete melting of pure Ag powder, forming dense Ag thick film, occurred at 700 degrees C. Whereas at this temperature, partial melting of the I wt BaTiO3-coated Ag powder occurred, forming Ag thick film with a porous structure. The pure Ag thick film shrunk 45% at 900 degrees C. However, the thick films formed from I and wt % BaTiO3-coated Ag powder had respective shrinkages of 31 and 21%, respectively at 900 degrees C. The sheet resistances of the Ag thick films formed from the I wt % BaTiO3-coated Ag powder were 7.54, 4.93 and 4.09 m Omega/sq at firing temperatures of 700, 800 and 900 degrees C, respectively. (C)2012 The Ceramic Society of Japan. All rights reserved.